Gas, flame, heat, vibration and sound are different failure modes of the same event. Watching them on one device is what turns a late alarm into an early one.
Separate channels cover smoke and LPG, carbon monoxide, solvent and alcohol vapour, and general air quality. Between them they span the leaks and combustion by-products a process plant is realistically exposed to - and because they are read together rather than separately, a reading that moves without corroboration is treated as a question about the sensor rather than an answer about the room.
An infrared flame sensor responds to the radiation signature of open combustion, not to particulates. It sees ignition before enough smoke has accumulated to trip a conventional detector — which is exactly the window in which a fire is still small.
Vibration and sound level are the channels that catch a bearing going, a pump cavitating or a guard coming loose. They rarely trip a safety threshold on their own, but they move first, and they change how the model reads everything else.
A sound spike alone is noise. A sound spike with rising temperature and a vapour reading is a different event entirely. Detection is scored across channels, so the alert that reaches your team already carries the reason it fired.
